Mark’s garden is a rectangle that is meters long and meters wide.

This problem doesn't really have anything we can work with. But the possibilities are that we have values for the length and width. The question for this problem would most likely be the area or the perimeter. So if we re given the length L and the width W, the perimeter of the rectangle would have to be 2L + 2W and the area will be LW. 

Period is the time it takes for one “cycle” to complete. in the parent sine function, period is 2*pi since sin(0) = 0, sin(pi/2) = 1, sin(pi) = 0, sin(3pi/2) = -1, and sin(2pi) = 0. at that point, the sequence repeats itself. i’m not sure if your graph is similar to the sine function since you didn’t provide a picture, but you can find the period by looking at a graph.